Fluoro-opto-electronic cell-counting on milk

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Abstract
Summary The equipment tested (Fossomatic) is a fully automatic electronic instrument for counting the somatic cells in milk samples. The results are printed on a paper strip and displayed on a digital counter. The capacity is 180 samples/h. Counting results obtained with the instrument have been compared with direct microscopic cell counts and particle counts by Coulter counter. The correlation coefficient with microscopic cell counts was 0·922–0·988, and with counts by the Coulter counter it was 0·916–0·992. Reproducibility showed a coefficient of variation of 2–5 %. The carry-over between the samples was 2·0 %. Preserving milk samples with 0·05 % potassium dichromate did not influence cell counts, whereas freezing the samples reduced the counts 30 %.